Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cc1bf1f9c10013…

MALICIOUS

PDF

80.8 KB Created: 2020-11-17 02:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b1cc1014dcaca979907f4b744136a0e3 SHA-1: d9bd45b5457f831e5a57333634dde8c5e377e9d4 SHA-256: d2cc1bf1f9c100136c8477bbdd683a0b1a12d3d92ecc9d422ef61ff2d5a478b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to sheet music, which is used as a lure to direct users to external URLs like https://traffking.ru/strik. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/strik?utm_term=away+in+a+manger+sheet+music+piano+easy PDF link annotation
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/2aac6a4d6b5392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f8b4d8a53652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f873a5f7a929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f997ae2c4d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f91036110c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_5fa828ec75c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f945423203bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fb3031522f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f8995d328ac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fac2d1f1a726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/579f0d9c-7ad0-437c-bca9-b5c298660f22/fawedibebinivajopab.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/your_health_today_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9a8217-2f08-43ea-957c-2ee171d03369/80496524989.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5500 bytes
SHA-256: d8d148258c92b4b3fdbc7b39a8e0670eeca11bd5ca7b4407da93c864ed23858e
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10888 bytes
SHA-256: 61fcda2688704a6dad5da531c2e0f18acabda83b036f2962caee4f5c58e6beb7
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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